How to get all thetext of a pView implements IVsTextView

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C#

Visual-Studio

extension

Recently, I do some work in Visual Studio Extension.See the code,in the Method OnRegisterView in Class TextManagerEventSink,I want to get all the text of this pView. However,all the Method of interface IVsTextView seems useless, could anyone help?

public class TextManagerEventSink : IVsTextManagerEvents
       {
           public void OnRegisterMarkerType(int iMarkerType)
           {

           }
           public void OnRegisterView(IVsTextView pView)
           {
               CommandFilter filter = new CommandFilter();
               pView.AddCommandFilter(filter, out filter.NextCommandTarget);

           }

           public void OnUnregisterView(IVsTextView pView)
           {
           }

           public void OnUserPreferencesChanged(VIEWPREFERENCES[] pViewPrefs, FRAMEPREFERENCES[] pFramePrefs, LANGPREFERENCES[] pLangPrefs, FONTCOLORPREFERENCES[] pColorPrefs)
           {
           }
       }